Oil and gas well swab



H. J. SMALL OIL AND GAS WELL SWAB Filed June 13, 1927 Aug. 13, 1929.

../a 11111111111|1111H11|1|11||111|1|H111|1 1.111.111.1141

.55X m 1 1 1. 1 1 1 1 1 1 1 111 111,111.1 112,1 11111111 111 T111 Patented Aug. 13,' 1929.

1,724,736 UNITED STATES PATENT oEFlcE.

HAYWARD J'. SMALL, 0F CLABKSBUBG, WEST VIRGINIA.

OIL GAS WELL SWAB.

Application led .Tune 13,

This invention relates to improvements in oil and gas well swabs, and more particularly to a swab which may be lowered in a well casing with entire freedom despite the various obstructions common in long strings of casing and tubing in bored wells, and which may be expanded, when desired, to lift the fluid from the Well casing.

An object of the invention is to provide m on oil and gas well fluid swab which will be provided with a tapered stem on which the rubber swab is slidably mounted, and the further provision of an adjustable collar on saidstem to limit the movement of said swab and consequently limit the desired degree of expansion of the swab.

A further object` of the invention is to provide an oil and gas well fluid swab which will be mounted on a hollow tapered stem,

thereby permitting the fluid to pass upward through said stem as the swab is lowered in a well casing, and the swab caused to be expanded upon an upward movement of the4 stem, to force the fluid from the well casing.

Other objects will tion proceeds.

In the accompanying drawings, which forma part of m application:-

Fig. 1 is a verticalsectional view through my improved swab showing the same in relaxed position within a well casing;

Fig. 2 is a vertical sectional view through the swab showing the same in expanded position;

Fig. 3 is a sectional view taken on the line 3 3 of Fig. 1; and

Fig. 4 is a sectional view taken on `the line 4`4 of Fig. 2.

Like characters of reference are used appear as the descripthroughout the following specification and the accompanying drawings to designate .corresponding parts.

I have illustrated my improved swab 1n relaxed and expanded position within a well casing 1. A tapered stem 2, the base of which isI always .the lower end, isprovlded with alongitudinall extending uid passage 3, and is threa ed at its upper end .4 and lower end 5. A checl: valve 6 is positioned adjacent the upper end of the stem 2 and` controls the flow of fluid through the stem as the swab is lowered in the well casing 1.' The movable weighted collar 7 5 is slidably mounted on the stem below the mounted on 1927. Serial No. 198,587.

check valve 6, while-an adjustable collar 8 having a double-diametered bore,` is mounted on the stem adjacent the lower end thereof, and is held in the desired position, by means of a lock nut 9.

Interposed between the movable collar 7 and the adjustable collar 8, and slidably the tapered stem 2, is an expansible rubber swab 10, which, when relaxed, is slightly smaller in diameter than the bore of the well casing 1. It will be understood that the swab and stem will be attached to a weight or sinker (not illus trated.)

The mode of operation of my fluid swab is as follows: The rubber swab is slipped over the tapered stem until it expands suficiently to provide a tight tit against the inner wall of the Well casing 1. nut 9 is thentightened until the adjustable nut 8 contacts with the lower end of the rubber swab 10. After this theA swab is moved to its highest point on the tapered stem l or until it is relaxed to its normal position (Fig. 1). T'he swab is then ready to be lowered into the well by means of a cable and drum. As the swab is lowered into the fluid in the well, the fluid passes through the fluid passage in thestem and by the check valve 6. When it is desired to raise the swab, the stem is pulled upwardly, thereby closing the check valve, and the pressure of the fluid upon the top of the weighted collar 7 and the rubber swab causes them to slide down on the tapered shank and through the internal expansion due to the The lock swab and Aalso the compressive action from the fluid and the weighted collar, the swab is caused to snugly engage the walls of the well casing. Further lifting of the swab and the fluid entrapped thereabove consequently causes the forcing Aof the fluid from the casing. p

Many minor changes in detail of construction may be resorted to without de` parture from the spirit of the invention.

1. An oil or as well swab, comprising a longitudinally ored stem of substantially uniform' external diameter from its u per end to a; point between its ends and of) increasing'diameter from said point toward its lower end, a substantially cylindrical compressible plug having` an axial bore through which said stem is longitudinally slidable, a collar secured to said stem adjacent its lower end of the plug when said stem is moved longitudinally upward through said plug, a sleeve of smaller exi" ternal diameter than said plug freely slidable on the first named portion of said stemv and resting directly on the upper endof said plug, and means on said stem above said sleeve for limiting the movementof said sleeve toward the upper end of the stem when said stem is moved longitudinallyl downward through said plug.

2. An oil or gas well swab according to claim 1 wherein the upper end of the collar and the lower end of the sleeve are concave.

3. An oil or gas well swab comprising a longitudinally bored stem of. uniform diameter from its upper end to a point between its ends and tapering from its lower end to -said point, a collar secured to the upper Vend of said stem, a second collar secured In testimony whereof I have hereunto set f my hand. A

1 HAYWARD J. SMALL.

Vcentrum:fait*or tomorrow.. l.

Patent "l, 7,24, l

"emiten, Aufn.: 1s, A1929. mV

It. is hereby certi-fied that error -ippears'hi' the printed specifi-cation of tlie above numbered'batetfeqniringcorrection as follows: -Page 2, Ime 3, claim i l, after the won-d lv'fehlii'ert the viol-ds "below" said 'plug'to bearaga-inst the' lower end thi'tf'tlieidLetters Patent shouldV beread with this correction therei'n th'at the lsmmiyfobnfom tothe record of vthe caee ,inthe Patent Office.

sign-eg sealed :his 10th any f september, n n.v 1,929.. 

